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Патент USA US3021014

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Filed Jan. 7, 1959
5 Sheets-Sheet 1
Feb. 13, 1962
Filed Jan. 7, 1959
F76. .5
5 Sheets-Sheet 2
Feb. 13, 1962
Filed Jan. 7, 1959
5 Sheets-Sheet 3
P76. 7
Feb. 13, 1962
Filed Jan. 7, 1959
5 Sheets-Sheet 4
Feb. 13, 1962
Filed Jan. '7, 1959
5 Sheets-Sheet 5
5 2175/1
"1 2}
United States Patent‘ 0 ” ICC
Patented Feb. 13, 1962
front portion, of the container, at the stage just before
commencement of the extruding operation;
FIG. 9 is a section corresponding to FIG. 8 at the stage
of progressing extruding operation;
Paul-Gunther Erbsliih, Wuppertal - Barmen - Blombach,
and Harry Willie, Wuppertal-Ronsdorf, Germany, as
signors to Julius & August Erbsloh Kommanditgesell
FIG. 10 is a section corresponding to FIGS. 8 and 9 at
the stage showing extruding operation practically com
schaft, Wuppertal-Barmen, Germany
Filed Jan. 7, 1959, Ser. No. 785,383
3 Claims. (Cl. 207-2)
FIG. 11 is a section corresponding to FIG. 8 using a
preshaped ring of cladding metal and a premounted disc
The invention concerns an apparatus for cladding ex 10 of cladding metal;
‘FIG. 12 is a section corresponding to FIG. 11 at the
truded metal shapes, in order to render corrosion-proof,
stage after commencement of the extruding operation, but
without a premounted disc;
the surface of core material which is insu?iciently corro
sion proof, for example, to provide copper containing
aluminum alloys with a corrosion proof plated layer of
pure aluminum.
FIG. 13 is a modi?cation of FIG. 8 having a control
15 device for the movement of the die carrier; and
FIG. 14 is a modi?cation of FIG. 8 having a movement
It is an object of the invention to use an extrusion
press in which a die with its backer or a cylindrical body
in front of the die, projects into a container of the ex
control device for the die carrier, using ring spring clamp
ing elements.‘
As shown in FIG. 1, the die 1 with its container 2
trusion press. The annular space formed by the die with
its container or the hollow body and the inner periphery 20 projects into a hollow space 4 of a container 5 adapted to
receive a core slug 3.
of the container which is separated from the core mate
The dimension a determines the height of an annular
rial, serves to receive the cladding material.
cladding metal 6 composed of cladding metal, which space
Such a device renders possible, in the case of extruded
shapes of aluminum and alloys thereof, for a glazeable 25 may be tapered conically outwardly in the direction to
wards the core slug 3. In this case the core slug 3 has a
surface of aluminum, having a high degree of purity (e.g.
correspondingly shaped end face, so that immediately on
99.8% to 99.9%), to be produced during extrusion. This
commencement of the extruding operation the material
Step has the advantage that the core slug may be com
?ow lines assume the shape corresponding to the normal
posed of a material having good mechanical properties,
for example, high strength, without having to consider 30 ?ow process.
The die 1 and its container or backer 2 are mounted so as
the surface properties (insuf?cient resistance to corrosion
to be longitudinally displaceable. The movement control,
and/ or glazeability). ‘Since, however, it is possible for a
in the example shown in FIG. 1, is effected by means of a
core material of a lower degree of purity (e.g. 98%
medium 7, ?owing under high pressure, for example a soft
aluminum or alloys based on 98% aluminum) to be used,
metal, which is discharged through the narrow channel 8.
the invention will also bring about a saving in material and
regulating valve (not shown) may be provided at the
subsequent treatment costs.
end of this channel. This ?ow medium 7, is situated
The apparatus hitherto used for applying a layer of
in a piston space 9 within the die head 10. A piston-like
annular ?ange 11 of the die backer or container 2_ dis~
cladding on extrusion products are cumbersome and un
certain regarding the uniform thickness of cladding ob
In contradistinction to the above, the present invention
places the mediumv 7 during extrusion. The discharge
speed of the medium is so chosen that the yielding of the
die 1 rendered possible thereby is effected to the extent
that cladding metal 6 is carried along by the extruded
shape emerging from the die 1. This produces a com
renders possible, by means of a conventional extrusion
press, to carry out a perfectly uniform cladding operation
in the course of the normal extruding operation, whereby
the thickness of the cladding to be produced may be select
ed within a considerable range of values and with the im
portant advantage that the thickness of cladding once
chosen, is uniform, over the whole length of the extruded
shape, and faultless.
The invention will be described further, by way of
example, with reference to the accompanying drawings, in
FIG. 1 is a section through the container of an ex
trusion press in the region of the die which is projecting,
with its displaceably mounted guide, into the container.
pletely uniform thickness of the cladding resulting there
In the examples shown in FIGS. 2 and 3 there is used
a principle corresponding to FIG. 1 with the modi?cation
that the ?ow medium 7 arrives in passages 8' in the pe
riphery of the annular piston ?ange 11 during the yield
50 ing of the die 1 with its backer 2 having the annular
piston ?ange 11, from the front surface of‘ the annular
piston ?ange to the rear surface thereof. On comple
tion of the extrusion operation (see FIG. 3), a die head
10 designed as a mirror image of the head 10 of FIG.
FIG.- 2 is a modi?cation of FIG. 1 using the circulatory 55 2, after shifting the die 1 to a, recess 1’ provided on the
other side of the die head, can be turned through 180°
over?ow principles with regard to the medium controlling
and remounted on the container 5.
the movement of the die and its container namely at the
In the example shown in FIG. 4 there-is used a lever
beginning of the extrusion operation;
mechanism 13, 14- mounted at a point 12 and adapted
FIG. 3 is a section corresponding to FIG. 2 on com
60 to be actuated and controlled from the outside for con
pletion of the extruding operation;
trolling the longitudinal movement of the die 1 with its
FIG. 4 is a section corresponding to FIG. 1 showing
backer 2. The lever mechanism 13, 14 engages, by way of
the use of a lever control for the movement of the die
a pair of guide bars 15, a sleeve-like insert 16 mounted in
and its support;
the die head 10, which insert abuts against an annular
‘FIG. 5 is a section through the container, in the region
of the ?xed die and its container, using supply carriages 65 ?ange 11’ of the die backer 2. In place of the lever me
chanism 13, 14 there may be provided a large worm,‘ the
to a cladding chamber, after the press has been charged;
thread of which acts on the sleeve insert 16 which, in this
FIG. 6 is a section corresponding to ‘FIG. 5 at the be
case, is rotatably mounted relative to the die backer 2,
ginning of the extruding operation;
for example, by means of interposition of a ball bearing.
FIG. 7 is a section corresponding to FIG. 5 during the
In the arrangement shown in FIGS. 5 to 7, a pre
extruding operation;
FIG. 8 is a section through a part of an alternative
embodiment of an extrusion press in the region of the
mounted hollow body 2’, projecting into the container
bore 4, is ?xedly mounted on a die head 10’. ‘The body 2’
however has supply passages 17, through which the
cladding metal 6 can be discharged. In the die head 10’
there is disposed a double die 1, 18. The internal meas
urements d1 of the die step ‘18 are larger by the desired
distributed over the periphery. These bores terminate
in narrow grooves 23' or they lead directly into the
hollow space of the die carrier 2.
Air locks are also prevented in the arrangement shown
thickness of cladding than the internal dimensions d2 of
in FIG. 11 in which, before commencing the extruding
the preliminary die 1 for the core metal 3. An annular
space 19, in which the cladding metal is ?rst discharged
operation, a preshaped cladding metal body 6b 1s m
serted. When the extruding operation commences the
and from whence it is carried along by the extrusion 21
protruding collar 6a of the cladding metal 6 is ?attened,
as the cladding layer 20, is provided between the end
thus causing cladding to be effected soon after the ex’
of the supply slot ‘17 and the die step 18. Separating 10 truded products 3' emerge from the press.
lines of the assembly of the dies 1, 18 of the head It)’
As the friction between the die carrier 2 and the‘
and the front part 2' have been omitted from FIGS. 5 to 7
cladding metal 6 decreases due to the shortening of the‘
in the interest of better clarity.
friction surface in course of the extruding operation and
In the example shown in FIGS. 8 to 14, the die carrier
2, on its end projecting into the hollow space 4 of the con
tainer, has an annular ?ange 2", which partly covers the
cladding metal ring 6. The hollow space 6' is thus con
stricted and it is advantageous to impart to the ring 6 of
cladding metal an initial shape corresponding to this
hollow space 6’, as shown in ‘FIG. 11. As shown in
FIG. 11 a collar 6a may even overlap the ?ange 2" and
moreover, a disc 6b may be inserted between the ?ange
2" and the core slug 3.
therewith the braking e?ect acting on the die carrier de
15 creases, it is advisable to compensate the reduced braking
As shown in FIGS. 8 to 10, the core slug 3 exerts a
pressure on the annular ?ange 2" of the resiliently or
displaceably mounted die carrier 2 and hence on the
cladding metal 6 which, under the action of this high
surface pressure, escapes through the slot formed be
tween the outer surface of the ?ange and the inner wall
action by means of a steel cylinder 24 having a conical
bore. This causes the distance between the die carrier
?ange 2" and the conical inner wall of the steel cylinder
24 to be reduced in course of the extruding operation,
so that the ?ow resistance for the cladding metal gradually
The constriction body 24 may be provided
as an independent insert, or it may form an integral part
of the container 5 or the die head 10, as indicated alter
natively in FIGS. 8 to 14.
The cladding material 6 however may also be used to‘
participate in lubricating the die carrier 2 in the die head
It) by the fact that, between these two members, there is
provided a narrow gap 26 as indicated in FIG. 8. Thus
'there is simultaneously obtained a progressively in~
of the container, and is then carried along by the core 30 creasing braking effect, as the length and hence the ?lling
metal in the direction of the die perforation.
measure of the gap space 26, is progressively increased.
To maintain the speed of yielding of the die backer
We claim:
constant in relation to the extrusion speed for obtaining
1. In an extrusion press for producing pro?led bodies,
a uniformly thick cladding layer and for the layer to be
in combination, a billet container with a generally elon
so dimensioned that the desired thickness of cladding is
gated billet chamber having a discharge extremity that
not substantially lower or exceeded, it is convenient to
is closed except for a bore therethrough coaxial with
use an additional or regulating mechanism for example,
corresponding to the one shown in FIG. 4. As the main
portion of the pressure acting on the die carrier has
already been absorbed by the ?ange 2" because it abuts
against the cladding metal 6, it is possible for the re
maining pressure to be absorbed by means of a regulable
or controllable device in such a Way that uniform cladding
is produced over the entire extrusion length at a pre
said chamber, a longitudinally displaceable die holder
slidably disposed in said bore, said die holder having an
annular ?ange projecting radially therefrom at the billet-1
engaging end thereof, said ?ange being spaced from the
the walls of said chamber, thereby forming with said
walls an annular compartment opening toward the other
extremity of said chamber; a die in said holder at said
billet-engaging end, said die having an extrusion ori?ce
determined thickness, this control device now having 45 extending therethrough; and ram means recipr'ocable in
to manage substantially lower forces.
said chamber remote from said die for forcing a billet of
Whilst in the design of the embodiment shown in
a ?rst material ?owable under pressure out of said cham
FIGS. 1 to 3 the whole pressure bearing on the surface
ber and through said die and concurrently exerting
formed by the upper surface of the die and the cross
pressure on said ?ange causing the latter to force a
sectional surface of the die carrier surrounding the die,
continuous ?ow of a second material ?owable under
reduced by the frictional resistance between the jacket
pressure from said compartment between said ?ange and
surface of the die backer and the cladding metal, is at
said walls of said chamber into contact with said ?rst
rest and will have to be absorbed by the regulating
material whereby said second material is carried by said
device, in accordance with a further feature of the in
?rst material through said die and forms a surfacing
vention only the remaining pressure bears on this regu
layer on the body thus produced.
lating device. This pressure, for example, amounts on an
2. The combination set forth in claim 1 wherein said
average to only 20% of the pressure exerted on the die
?ange has at least one passage extending from the periph
and the environment thereof, and can therefore be easier
ery thereof to a location beyond said extrusion ori?ce.
3. The combination set forth in claim 1 wherein said
A further possibility of regulation shown in FIG. 14 re 60 compartment has walls converging toward said discharge
sides in that, by means of annular ring sets 25, 25’ there
is exerted a regulable breaking action on the feed ad
vance of the die carrier. These annular springs 25, 25'
References Cited in the ?le of this patent
are provided with conical surfaces compressed to a
greater or lesser extent by means of tightening the screw
vconnection 22 to a greater or lesser extent. It is also
possible to replace the annular springs which, for pre
venting corrosion, are all or partly composed of bronze,
by packing material of asbestos with graphite or the like.
To avoid air being trapped between the core material
and the cladding material it is expedient for the space 6' 70
to be ventilated (see FIGS. 8 and 14). To this end, in
the front region of the die carrier 2 there are formed
bores 23 having a very small diameter (e.g. 0.6 mm.)
Granniss _____________ .._ Mar. 12, 1872
Hoopes et al ___________ __ Oct. 8, 1907
Krause ______________ __ Apr. 29, 1958
Stulen _______________ __ May 19, 1959
Great Britain __________ __ June 9‘, 1949
Germany ____________ __ July 17, 1952
Germany ____________ __ Mar. 18,, 195.4.
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